Question 1

Generating multiple message frames containing identical data being transferred to different individual devices is called:

Accepted Answer

Replicating unicast involves sending multiple copies of the same data to different individual devices, each as a separate unicast message.

Question 2

Which of the following is NOT a primary type of DAS antenna?

Accepted Answer

Polarized is not a primary type of DAS antenna; it refers to the orientation of the electromagnetic waves, not the antenna type.

Question 3

What is at the "root" of a DAS (distributive antenna system)?

Accepted Answer

The answer of What is at the "root" of a...

Question 4

You are designing a 4.9 GHz microwave system that is using rectangular waveguide from the transceiver to the inside wall of the shelter and an antenna using elliptical waveguide from the antenna to the outside wall of the shelter. The antenna has been designed to be placed 200 ft up on a 250 ft tower. What device will you specify that will best interconnect the two different waveguides?

Accepted Answer

The best choice for interconnecting the two different waveguides is an elliptical waveguide connector. This is because it allows for a reliable and low-loss connection between the two waveguides while maintaining the integrity of their respective shapes. A pass through or clamp may not provide a secure connection, and a flange would require significant modifications to both waveguides for installation.

Question 5

What device is used in both wired and wireless networks to link network access devices?

Accepted Answer

The answer of What device is used in both wired...

Question 6

The purpose of QoS on an IP network is for:

Accepted Answer

The answer of The purpose of QoS on an IP...

Question 7

In order to maximize its ability to send and receive, an antenna should be ________ to the desired frequency.

Accepted Answer

Tuning an antenna to the desired frequency ensures that it resonates at that frequency, maximizing its ability to send and receive signals of that frequency. Dipping, loading, and peaking may also impact the antenna's performance, but tuning is the most important factor.

Question 8

MAC addresses are _____________ bits in length.

Accepted Answer

MAC addresses are 48 bits in length, which is commonly represented as 12 hexadecimal digits (0-9,A-F) separated by colons or hyphens.

Question 9

You are working with the Sheriff's Department to develop a public safety wireless network that will be secured from interference and have the capability of delivering up 10 Mbps subscriber speed. What microwave frequency should be used to best meet these needs?

Accepted Answer

The 4.9 GHz band is designated for public safety use in the United States, providing a secure and interference-resistant frequency for public safety communications.

Question 10

Which active DAS component is responsible for coupling input signals from donor systems?

Accepted Answer

The answer of Which active DAS component is responsible for...

Question 11

You have been asked to design a public safety microwave radio system for the city of Fairbanks, Alaska. The requirement for reliability, maximum throughput, and minimum interference by fog, rain, or heavy snow is critical. Which frequency will best suit the system's needs?

Accepted Answer

6.0 GHz is less affected by atmospheric conditions like fog, rain, or snow compared to higher frequencies, making it suitable for reliable communication in Fairbanks, Alaska.

Question 12

The MINIMUM number of antennas needed to create a DAS is:

Accepted Answer

A Distributed Antenna System (DAS) can be created with just one antenna, as it refers to a network of spatially separated antenna nodes connected to a common source.

Question 13

The loop distance range in an "ethernet in the first mile" (EFM) design is:

Accepted Answer

The answer of The loop distance range in an "ethernet...

Question 14

You are designing multi band UHF police radio and VHF fire radio systems for a municipal office. Because of the closeness of the transmit and receive frequencies, you must ensure there is adequate filtering and gain control of the systems. Which device will best meet the ability to separate and control the transmit and receive signals?

Accepted Answer

A repeater is the best choice for separating and controlling the transmit and receive signals. It receives a weak or low-level signal, amplifies it, and re-transmits it at a higher level or power to the other end of the communication circuit. It has separate antennas for the transmit and receive signals, filters for controlling interference and noise, and gain controls for regulating the signal strength. This allows the repeater to effectively separate the transmit and receive frequencies and ensure clear and reliable communication.

Question 15

When considering the DAS, which component acts as a bidirectional antenna?

Accepted Answer

Radiating coaxial cable is designed to act as a bidirectional antenna in distributed antenna systems (DAS). It is used to distribute radio frequency signals from the base station to multiple antennas throughout a building or campus. The other cable types listed (multimode optical fiber cable, shielded twisted pair (STP) cable, single mode optical fiber cable, and screened twisted pair (ScTP) cable) are not used as bidirectional antennas in DAS.

Question 16

A 24 port layer 2 switch can perform all of the following functions EXCEPT:

Accepted Answer

A layer 2 switch is designed to operate at the data link layer and is restricted to only forwarding frames based on Media Access Control (MAC) addresses. It does not perform routing functions which are performed at the network layer. The other options, such as bridging, link aggregation and full duplex operation, are functions that a layer 2 switch can perform.

Question 17

Route congestion and message priority are a few of the functions of what layer of the OSI Model?

Accepted Answer

Route congestion and message priority are functions of the Network Layer (Layer 3) of the OSI Model.

Question 18

ITU-T G.655 recommends which type of singlemode optical fiber?

Accepted Answer

ITU-T G.655 recommends NZ-DSF (Non-Zero Dispersion Shifted Fiber) as it has a low attenuation and better dispersion properties at 1550 nm wavelength, making it suitable for long-haul optical transmission applications. DSF (Dispersion Shifted Fiber) and SF (Standard Fiber) have higher attenuation and dispersion values, while N-DSF (Non-Zero Dispersion Shifted Fiber) has higher dispersion values at 1550 nm wavelength, making it unsuitable for long-haul applications.

Question 19

A tapped trunk topology uses ________ cabling to support a DAS.

Accepted Answer

A tapped trunk topology involves a main trunk cable with branches connecting to individual devices. This requires a reliable and high-speed transmission technology, which is best supported by optical fiber cabling. Optical fiber offers high bandwidth, low latency, and immunity to electromagnetic interference, making it an ideal choice for DAS systems. Shielded twisted pair cabling may also be used, but it may not provide the same level of performance and reliability as optical fiber. Therefore, the best choice is optical fiber cabling.

Question 20

A ______ intercepts a file and stores it temporarily in queue until a peripheral device (e.g. printer) is available.

Accepted Answer

A spooler is a software program that intercepts a file and stores it temporarily in queue until a peripheral device, such as a printer, is available to process it. This allows multiple print jobs to be queued up and printed in the order they were received, without creating a backlog of print jobs waiting to be processed.

Exam 1: BICSI Registered Communications Distribution Designer - RCDD